Improvement in machines for forming molds



3Sheets-Sheet 1 R. J. HOWDON. MACHINE FOR FORMING MOLDS.

No.172,318. Patented J'an.18,1876.

N. PEFERS. PHOTO-m NOGRAFHER, WASHINGTON. D C.

' 3 Sheetx-Sheet 3. R. J'. HOWDON.

ILA-CHINE FOR FORMING HOLDS. N0.17Z,318. Patentqd Jan. 18, 1876.

N-PETEIS. HIOTO-UTHOGRAPRIR. WAIMYNGTON. D. c-

To all whom it may concern:

have invented an Improvement in Moldingcation follower-board and consists, first, in connec pf certain peculiar devices, which secure the match-plate reversibly and rigidly, and permit and working in contrary directions by one vice adapted for reversal.

. UNITED STATES- PATENT, QFFIGE.

ROBEBT'J. nownon, or CINCINNATI, OHIO, AssIeNoRoF ONE-EIGHTH HIS RIGHT TOJOHN D. VANCE, OF SAME PLACE.

IMPROVEMENT IN MACHINES FoR FORMING MOLDS.

Specification forming pa'rtof Letters Patent No. 172,318, dated January 18, 1876; application filed May 3i, 1875.

Be it known that 1, ROBERT J. Hownon, of Cincinnati, Hamilton county, State of Ohio,

Machines, of which the following is a specifi- My invention relates to a classof molding-- machines which operate bydrawing the patterns attached to a watcher-plate through a tion with the follower-board or pattern-frame,

its efficient operation in drawing; the object being to furnish a machine that will perform a large variety of work by the use of differ ent match-plates, and that can draw the counterparts of the same pattern by providing for the reversing of the plate.

My invention consists in the second part, in connection with a. suitable retaining-frame, of certain peculiar devices, concerted in action and the same power, for the purpose of drawing the counterparts of a single pattern from the two parts of a flask, so that the parts of the flask and their inclosed impressions will perfectly coincide when put together; or this double-acting device maybe used to draw entirely different patterns. i

I My invention consists in the third part, in connection with aforesaid retaining-frame, of peculiar reciprocating devices for securing the patterns in position while being rammed.

My invention consists in the fourth part, in connection with carrying projections on the racks which move the match-plate, of a peculiar construction of match-plate to permit reversibility. f

Figure 1 is a cross-section of a molding-machine embodying my device looking toward X, Fig. 3. Fig. 2is a cross-section of the machine looking toward Y, Fig.3. Fig. 3 is a sectional plan of the machine. Fig. 4 is a perspective view of a modification of my de- Fig.5 is a perspective view ofthe stop for the modification shown in Fig, 4.

The Figs. 1, 2, and 3 of drawing represent adouble machine-that is, one adapted to draw both halves of the same pattern, or two different patterns at the same time, and description will be embodied hereafter of the modified construction adapted for operating upon a single part of the mold.

A A represent two follow-boards, upon which the separate halves of the flask are to be received. Between these follow-boards a frame,

B, into which the patterns are drawn, is provided, secured in proper relation to the followboards by. dowel-pins, or other means of security. The two halves, or separate parts, a

a, of the pattern, are secured to the sliding frames or match-plates O 0 moving within 9 the frame B, and correspond in size to the apertures in the follow-boards. In the drawing two forms of patterns are shown, one, a, having no interior formation, and the other such as is used for pulleys having an annular" shape, which leaves a central portion of sand. In order to properly support this sand I prefer to have a follow-board, A", for the center, supported from the board A by connectingpieces D, which bridge, as shown, over the pattern; The operation of a shaft, E, journaled in the frame B, suffices to draw both patterns, a a, inward to a position wholly inside of the frame B, and in the act of thus drawing inward the pattern is preserved in line, and the sand fully supported upon the follow-hoards A A A, so that it cannot be dis-.-

Gr," attached to the pattern-frame G, and 'on the other side meshes into a rack, H, which is attached to the other pattern-frame C, so I 1 that said frames are made by the rotation of said shaft to move in oppositedirections. In thismodification the strain upon the frames 0 G is communicated through single racks, so that reliance has to be placed upon the side guide 0 of these frames to preserve them horizontal.

tern-frame G, and racks J J to the pattern- Two modifications of frame 0, and the rack I gearing into pinion H. and the rack I gearing into the pinion K, which meshes into wheel H. The rack J meshes into the wheel H, and the rack J into the wheel L. To the pattern frames, or match-plates O 0, stops M are pivoted, as shown, which, by swiveling, when the patterns are fully exposed above the followboards, are adapted to move into notches m in the frame B, and support the patterns against the force of ramming.

By relieving the stops from the notches the patterns may be drawn inward in the manner described, the ends of the stops moving in the slots m. In the modification, Figs. 4 and 5, the three important parts are necessary: the follow-board, through which the pattern moves, (not shown,) the match-plate or pattern-frame G, and the stop M, the latter having the same notches and slots 1% m, as are shown in the other figures; but the stop itself is not pivoted to the frame 0, for the reason that the latter is reversible and does not permit of the fastening of the stop to the frame 0. In this modification the plate 0 is reversible, and if the pattern (both halves of which are secured to the plate, one on each side) is irregular the follow-board also is reversible. By means of set my hand.

the projections N, notches O, and groove P, the plate 0, by dropping and sliding to fasten, is rendered reversible, and is securely held by the projections N when in place, so as to move with the racks. A sufficient thickness of material, same shape as pattern, must be left, as at w m, Fig. 4, for the thickness of the follow-board.

I claim 1. The combination of follow-board A, pattern or match plate 0, and stop M,'operating in slots mm of the main frame, substantially as and for the purpose specified.

2. The combination, substantially as specifled, of the two follow-boards, the corresponding two reciprocating pattern-frames or matchplates, and the racks and pinions gearing for simultaneously operating said match-plates.

3. In combination with carrying-projections N the reversible plate 0 0 P, operating substantially as and-for the purpose specified.

In testimony of which invention I hereunto ROBERT J HO'WD ON.

Witnesses:

EDGAR. J. Gnoss, J. L. WARTMANN. 

